The calibration record set

Each sheet is the written half of a procedure that already exists. The steps are numbered here the way they are numbered there, so a sheet is filled in from top to bottom while the procedure is followed from step 1: CA-1 to CA-3 follow checking the balance and verifying the thermometer, and CA-4 and CA-5 follow calibrating a pH meter. CA-6, the graduate, is the third of the three commissioning checks, taught in commissioning your laboratory.

Print the instrument you are checking, not the set. A filled sheet goes into the calibration log at the front of the notebook, one instrument to a page, because ten entries on one page make a drifting thermometer visible and no single check can do that.

!CA-7 follows no procedure, and says so

The timer sheet is the one instrument in this set with no procedure behind it. The SOP library has no timer check, and Part XVII, which owns the timer, is not written. CA-7 therefore records what can be recorded honestly — a comparison against a second clock, in the same shape as the balance and the thermometer: reading, reference, deviation, action — and it publishes no acceptance limit and no interval, because no source in this course’s corpus establishes one for a domestic timer. Decide your own limit from what you use the timer for, and write it in the action field where a later reader can see the judgement you made.

Printing, versions, and why nothing on a sheet explains anything: see printable worksheets.

Pure Silver · The calibration record set

CA-1

The balance — the session, the drift, and the ten readings

One balance, one check. Steps 1 to 3 of the procedure.

Sessionbefore

Date

Checked byinitials

Balance, make and model

Resolutiong

The deviation currently written on itg

Why this checkcommissioning / your interval / moved or dropped / battery out / a surprising result / a small mass matters

Step 1 — level, still, away from a window and a radiator, switched on and settled

Step 2 — driftas you go

Zeroed athh:mm

Reading five minutes laterg

Driftg, and 0.00 is a result

Step 3 — the ten readingsas you go

Trial	Readingg	Anything you noticed
1
2
3
4
5
6
7
8
9
10

Pure Silver · The calibration record setCA-1 · v1.1 · sheet 1 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-2

The balance — what the readings say, and the finding

The same check. Steps 3 to 12 of the procedure.

Step 3 — what the ten readings sayas you go

Calibration mass, stated valueg

Mean of the teng

Spread of the ten, max − ming — this is repeatability

Mean − stated massg — this is trueness

No calibration mass — trueness unmeasured, concentrations relative

Step 4 — off-centre loadingas you go

Position	Readingg	Difference from the centred meang
Centred, trial 1
Centred, trial 2
Near one edge, trial 1
Near one edge, trial 2

The finding, and what is done about itafter

Actioncorrect arithmetically / replace / accept and note

The deviation, as it will be appliedg

Written on the instrument in permanent marker

Next check, or the trigger you will use

Calibration log line written at the front of the notebook

Pure Silver · The calibration record setCA-2 · v1.1 · sheet 2 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-3

The thermometer — the ice point

One thermometer, one verification. Steps 5 to 12.

Sessionbefore

Date

Checked byinitials

Resolution°C

The deviation currently written on it°C

Thermometer, type and rangeliquid-in-glass or probe

Why this checkcommissioning / your own interval / dropped / has been in boiling water / a result surprised you

Steps 5 to 7 — the ice pointas you go

Trial	Reading°C	Reference0.0 °C	Deviation°C	Slurry still packed at the end
1
2
3

Stirred with the rod, and the bulb clear of the sides and the bottom

Stable for thirty seconds before reading, and the slurry rebuilt between trials

Steps 8 and 9 — the second thermometer, and the boiling pointas you go

Point	Liquid-in-glass°C	Probe°C	Difference°C
At the ice point
At room temperature

A constant offset, or a changing oneconstant / changing

Boiling point°C — a span check, never a calibration

The finding, and what is done about itafter

Actioncorrect arithmetically / replace / accept and note

The deviation, as it will be applied°C

Written on the instrument in permanent marker

Next check, or the trigger you will use

Calibration log line written at the front of the notebook

Pure Silver · The calibration record setCA-3 · v1.1 · sheet 3 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-4

The pH meter — the calibration

One meter, before one session. Steps 1 to 9.

Sessionbefore

Date and time

Calibrated byinitials

Meter, make and model

Electrode, and how old it is

Step 2 — temperature of the standards and the samples°C

Step 1 — the bulb was wet when the electrode came out of storage

The standardsbefore

Standard	Lot	Date opened	Temperature°C
pH 7.00
pH 4.01, for the calibration
pH 4.01, unopened until step 9

Steps 5 to 8 — the two pointsas you go

Rinsed with distilled water and blotted, never wiped

The pH 7.00 reading had stopped moving before the meter was set

Offset set at 7.00

The pH 4.01 reading had stopped moving

SlopemV per pH unit, or per cent of theoretical

Step 9 — verification against a standard the calibration never sawas you go

Check-standard reading

The meter's stated accuracy

Inside ityes / no

Pure Silver · The calibration record setCA-4 · v1.1 · sheet 4 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-5

The pH meter — the session, and the closing drift

The samples that calibration was for. Steps 10 to 13.

Step 10 — the samples, in order of increasing pHas you go

Sample	Time	Temperature°C	pH

Steps 11 to 13 — closingafter

Closing reading of the pH 7.00 standard

The session's drift from 7.00

Electrode back in its storage solution before anything was written up

No standard that had an electrode in it went back into a stock bottle

Action, and how this session's numbers will be reported

Calibration log line written at the front of the notebook

Pure Silver · The calibration record setCA-5 · v1.1 · sheet 5 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-6

The graduate

What one vessel delivers, by weighing the water it pours out.

Sessionbefore

Date

Checked byinitials

Vessel, nominal capacity and graduation interval

Water temperature°C

Balance used, and its deviation

The three trialsas you go

Trial	Filled to the markmL	Mass of water deliveredg	Volume deliveredmL	Drain times
1
2
3

The finding, and what is done about itafter

Mean volume deliveredmL

Difference from the nominal markmL, and as a percentage

Written on the vessel in permanent marker

Actioncorrect arithmetically / replace / accept and note

Calibration log line written at the front of the notebook

Pure Silver · The calibration record setCA-6 · v1.1 · sheet 6 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-7

The timer

One timer against a second clock. No limit is published for it.

Sessionbefore

Date

Checked byinitials

Timer, make and model

What it times, and the shortest time you rely on it for

The reference clock, and what makes it a reference

The trialsas you go

Trial	Interval set	Reference reading	Timer reading	Deviations	Deviationper cent of the interval
1
2
3

The finding, and what is done about itafter

Mean deviations

Mean deviationper cent

A constant offset, or one proportional to the intervalconstant / proportional

Actioncorrect arithmetically / replace / accept and note

Written on the instrument in permanent marker

Next check, or the trigger you will use

Calibration log line written at the front of the notebook

Pure Silver · The calibration record setCA-7 · v1.1 · sheet 7 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-8

Safelight fog test

One instrument or material, one dated measurement session.

Conditions and traceabilitybefore

Date and session id

Instrument or sample id

Reference and its uncertainty

Geometry and light source

Criterion declared before measurement

Environment and temperature

Measurementsas you go

Position / distance	Exposure duration	Control result	Exposed result	Difference

Decisionafter

Observed spread, uncertainty and exclusions

Pass against the declared criterion, or action required

Pure Silver · The calibration record setCA-8 · v1.1 · sheet 8 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-9

Enlarger alignment and uniformity

One instrument or material, one dated measurement session.

Conditions and traceabilitybefore

Date and session id

Instrument or sample id

Reference and its uncertainty

Geometry and light source

Criterion declared before measurement

Environment and temperature

Measurementsas you go

Field position	Lens / aperture	Focus result	Relative illumination	Deviation

Decisionafter

Observed spread, uncertainty and exclusions

Pass against the declared criterion, or action required

Pure Silver · The calibration record setCA-9 · v1.1 · sheet 9 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-10

Sensitometer repeatability

One instrument or material, one dated measurement session.

Conditions and traceabilitybefore

Date and session id

Instrument or sample id

Reference and its uncertainty

Geometry and light source

Criterion declared before measurement

Environment and temperature

Measurementsas you go

Run	Exposure setting	Reference response	Measured response	Deviation

Decisionafter

Observed spread, uncertainty and exclusions

Pass against the declared criterion, or action required

Pure Silver · The calibration record setCA-10 · v1.1 · sheet 10 of 11puresilver.runbook.academy/worksheets/calibration-records/

Pure Silver · The calibration record set

CA-11

Densitometer calibration

One instrument or material, one dated measurement session.

Conditions and traceabilitybefore

Date and session id

Instrument or sample id

Reference and its uncertainty

Geometry and light source

Criterion declared before measurement

Environment and temperature

Measurementsas you go

Reference density	Dark reading	Reference reading	Sample reading	Computed density

Decisionafter

Observed spread, uncertainty and exclusions

Pass against the declared criterion, or action required

Pure Silver · The calibration record setCA-11 · v1.1 · sheet 11 of 11puresilver.runbook.academy/worksheets/calibration-records/

Where the fields come from

Every field on these sheets is one a written page of the course asks you to record. Those pages are linked here, and the build fails if one of them stops existing.

• Procedure — balance and thermometer checkThe procedure sheets CA-1 to CA-3 follow, step for step, and the log line it ends with.
• Procedure — ph meter calibrationThe two-point calibration, the verification against a standard the calibration never saw, the closing drift check, and the log line.
• Part 2 — commissioning your laboratoryFive tables of instrument checks — the balance ten times over, the thermometer at its ice point, and what the graduate actually delivers.
• Part 2 — measurement and uncertaintyThe three checks you can actually perform, and why repeatability and trueness are different findings.
• Part 3 — measuring phRuns the meter's calibration, and keeps the calibration log at the front of the notebook.
• Part 17 — calibrating the timerArm 2, the timer against a second clock over an hour, and the timer certificate the arm's result is filed on.
• Part 16 — the safelight fog testRecords exposed and control material under the measured safelight arrangement.
• Part 16 — commissioning the enlargerRecords alignment, focus and illumination across the image field.
• Part 14 — calibrating the sensitometerRecords repeated exposure checks and the declared repeatability criterion.
• Part 15 — calibrating the densitometerRecords reference readings, calibration, geometry and residuals.

What these sheets do not carry

• Acceptance limits and review intervals remain declared by the student against the cited method; the course does not invent a domestic instrument standard.