OpenBCM V1.07b12 (Linux)

Packet Radio Mailbox

IW8PGT

[Mendicino(CS)-Italy]

 Login: GUEST





  
G8MNY  > TECH     07.07.17 09:16l 86 Lines 3847 Bytes #999 (0) @ WW
BID : 48762_GB7CIP
Read: GUEST
Subj: Lab Measuring DMM
Path: IW8PGT<IZ3LSV<IR1UAW<IQ5KG<I0OJJ<N9PMO<VE3UIL<ZS0MEE<GB7CIP
Sent: 170706/2242Z @:GB7CIP.#32.GBR.EURO #:48762 [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 & I am pleased to say is quite serviceable now after finding a
silly PCB plug fault.

ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³           Au 10ê.1 1k 10 100 1M 10M   ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿  ³
³I+ I- êG 4w|o||o||o||o||o||o||o||o|    ³ -³- | [] [] [] [] [] [] []       ³  ³
³(o)(o)(o)Ü [ ][ ][ ][ ][ ][ ][ ][ ]    ³     |ø[] [] [] [] [] [] []   m A ³  ³
³         2w 0  1  2  3  4  5  6  7     ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ  ³
³                                                                             ³
³ Hi Lo Gu LG 8  9  .  kbd   ñ Cl                           B C Lim Lim St    ³
³(o)(o)(o)Ü [ ][ ][ ] |o|  [ ][ ][ ]  [ ][ ][ ][ ][ ][ ]  [ ][ ][ ][ ][ ]  [] ³
³         RG|o||o||o| [ ]  |o||o||o|  |o||o||o||o||o||o|  |o||o||o||o||o|  [] ³
³            Z  F  I---fun--kê AC DC          Mode            Compute     Pwr ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ

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 ñ100nV or 126dB S/N.

DC VOLTS     Input Z   ---- Accuracy since last Cal------
Range:                     24hr,         90 day,   1 year
100mV        >10Gê    ñ10ppm or 0.001%,   30ppm,    45ppm
1 & 10V      >10Gê     ñ5ppm or 0.0005%,  20ppm,    30ppm
100V & 1kV   >100Mê   ñ10ppm or 0.001%,   30ppm,    45ppm

DC CURRENT             ---- Accuracy since last Cal------
Range:                     24hr,         90 day,   1 year
0.1-100mA              ñ50ppm or 0.005%, 100ppm,   150ppm
1A                    ñ100ppm or 0.01%,  200ppm,   300ppm
Shunts:100mV drop across all shunts for 100% (reads to ñ199%).

RESISTANCE     Test    ---- Accuracy since last Cal------
Range:      Current         24hr,        90 day,   1 year
10ê          10mA     ñ15ppm or 0.0015%,  40ppm,    60ppm
100ê         10mA     ñ10ppm or 0.001%,   30ppm,    45ppm
1kê           1mA     ñ10pmm or 0,001%    30ppm.    45ppm
10kê         100uA    ñ10ppm or 0.001%,   30ppm,    45ppm
100kê        10uA     ñ15ppm or 0.0015%   40ppm.    60ppm
1Mê           1uA     ñ30ppm or 0.003%,  100ppm,   200ppm
10Mê        100nA    ñ150ppm or 0.015%,  300ppm,   500ppm

Measurement is 2 or true 4 wire system & with up to 10ê 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      1Mê//150pF    ñ0.04%      ñ0.08%       ñ0.12%
1-100V     1Mê//150pF    ñ0.02%      ñ0.04%       ñ0.06%
100mV      1Mê//150pF    ñ0.04%      ñ0.08%       ñ0.12%

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 ñ0.01dB.
 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



Read previous mail | Read next mail


 24.12.2024 19:35:11lGo back Go up