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G8MNY  > TECH     05.05.22 09:03z 85 Lines 3846 Bytes #20 (0) @ WW
BID : 1429_GB7CIP
Subj: Lab Measuring DMM
Path: SP7YDD<SR8BBS<SR1BSZ<OK0NBR<F3KT<CX2SA<VE3CGG<GB7CIP
Sent: 220505/0832Z @:GB7CIP.#32.GBR.EURO #:1429 [Caterham Surrey GBR] $:1429_GB
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 & I am pleased to say is quite serviceable now after finding a
silly PCB plug fault.

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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        >10G    10ppm or 0.001%,   30ppm,    45ppm
1 & 10V      >10G     5ppm or 0.0005%,  20ppm,    30ppm
100V & 1kV   >100M   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
10          10mA     15ppm or 0.0015%,  40ppm,    60ppm
100         10mA     10ppm or 0.001%,   30ppm,    45ppm
1k           1mA     10pmm or 0,001%    30ppm.    45ppm
10k         100uA    10ppm or 0.001%,   30ppm,    45ppm
100k        10uA     15ppm or 0.0015%   40ppm.    60ppm
1M           1uA     30ppm or 0.003%,  100ppm,   200ppm
10M        100nA    150ppm or 0.015%,  300ppm,   500ppm

Measurement is 2 or true 4 wire system & 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      1M//150pF    0.04%      0.08%       0.12%
1-100V     1M//150pF    0.02%      0.04%       0.06%
100mV      1M//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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