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G8MNY > TECH 28.11.25 17:24l 85 Lines 3869 Bytes #6 (0) @ WW
BID : 46016_GB7CIP
Read: GUEST
Subj: Lab Measuring DMM
Path: JH4XSY<N3HYM<VE3CGR<PI8ZTM<CX2SA<ED1ZAC<GB7CIP
Sent: 251128/0811Z @:GB7CIP.#32.GBR.EURO #:46016 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Corrected Feb 16)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Years ago I bought a large not working 19" LAB DMM (Datron 1061a). It is an
extremely precise 7.5 digits DMM for its time of 1983. Luckily it came with all
the handbooks and I am pleased to say is quite serviceable now after finding a
silly PCB plug fault.
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ Au 10�.1 1k 10 100 1M 10M ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ｳ
ｳI+ I- 鶉 4w|o||o||o||o||o||o||o||o| ｳ -ｳ- | [] [] [] [] [] [] [] ｳ ｳ
ｳ(o)(o)(o)ﾜ [ ][ ][ ][ ][ ][ ][ ][ ] ｳ |] [] [] [] [] [] [] m A ｳ ｳ
ｳ 2w 0 1 2 3 4 5 6 7 ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ｳ
ｳ ｳ
ｳ Hi Lo Gu LG 8 9 . kbd � Cl B C Lim Lim St ｳ
ｳ(o)(o)(o)ﾜ [ ][ ][ ] |o| [ ][ ][ ] [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ] [] ｳ
ｳ RG|o||o||o| [ ] |o||o||o| |o||o||o||o||o||o| |o||o||o||o||o| [] ｳ
ｳ Z F I---fun--k� AC DC Mode Compute Pwr ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
Here is part of the exacting specification...
+/- 1.999999 on most ranges with the filtering & averaging options in.
e.g. with a 0.19V input, you can resolve down to �100nV or 126dB S/N.
DC VOLTS Input Z ---- Accuracy since last Cal------
Range: 24hr, 90 day, 1 year
100mV >10Gohm �10ppm or 0.001%, 30ppm, 45ppm
1 & 10V >10Gohm �5ppm or 0.0005%, 20ppm, 30ppm
100V & 1kV >100Mohm �10ppm or 0.001%, 30ppm, 45ppm
DC CURRENT ---- Accuracy since last Cal------
Range: 24hr, 90 day, 1 year
0.1-100mA �50ppm or 0.005%, 100ppm, 150ppm
1A �100ppm or 0.01%, 200ppm, 300ppm
Shunts:100mV drop across all shunts for 100% (reads to �199%).
RESISTANCE Test ---- Accuracy since last Cal------
Range: Current 24hr, 90 day, 1 year
10ohm 10mA �15ppm or 0.0015%, 40ppm, 60ppm
100ohm 10mA �10ppm or 0.001%, 30ppm, 45ppm
1kohm 1mA �10pmm or 0,001% 30ppm. 45ppm
10kohm 100uA �10ppm or 0.001%, 30ppm, 45ppm
100kohm 10uA �15ppm or 0.0015% 40ppm. 60ppm
1Mohm 1uA �30ppm or 0.003%, 100ppm, 200ppm
10Mohm 100nA �150ppm or 0.015%, 300ppm, 500ppm
Measurement is 2 or true 4 wire system and with up to 10� lead Resistance. And
it also measures in circuit 1 of 3 Rs.
AC RMS VOLTS Input Z ---- Accuracy since last Cal------
Range 24hr, 90 day, 1 year
100mV 1Mohm//150pF �0.04% �0.08% �0.12%
1-100V 1Mohm//150pF �0.02% �0.04% �0.06%
100mV 1Mohm//150pF �0.04% �0.08% �0.12%
Frequency Response flat 10Hz - 1MHz @ -2%
True RMS measurements to 7:1 crest to mean factor.
AC RMS CURRENT ---- Accuracy since last Cal------
Range: 24hr 90 day, 1 year
0.1-1A 0.1%, 0.2%, 0.3%
Shunts: as DC
True RMS measurements to 3:1 crest to mean factor.
Other features:
AC+DC True RMS option for Volts & Current as AC ranges.
Local or seperate screen guard system.
IEEE interface for automatic readings/logging.
Go/fail % testing.
Reading accuracy calculation.
Direct entry number keyboard.
dB calculation/readings on all ranges to �0.01dB.
Pre use calibrated self check.
Security key locked calibration, easy press button cal features.
See my tech bul on "Measuring 1 of 3 Rs"
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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