TB 9-6625-2189-24
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Dc ratio (models AN/GSM-64D and Fluke
Model 8840A/AF w/wo opt 05 only) .................
Software adjustments ..........................................
Final procedure ....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Multimeter AN/GSM-64D (Fluke, Model 8840A/AF with Option 05)
and Fluke, Model 8840A/AF with or without Options 05 and Fluke Model 8840A with or
without Options 05 and 09. TM 11-6625-444-14-3 and the manufacturers' manuals were
used as the prime data sources in compiling these instructions. The equipment being
calibrated will be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. Option 09 of model 8840A is true RMS (AC Voltage and AC
Current). If not equipped, disregard AC functions. Additional variations among models are
described in the text and tables.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Software adjustments to be reported are designated (R) at the beginning of the
subparagraph in which they appear. Report only those software adjustments made and
designated with (R). To report software adjustments, use parameter and range failing
performance check; i.e., 10 V dc, 100 , etc.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Performance specifications
Test instrument parameters
5 1/2 digit display @ S reading rate
Ranges
Accuracy
200 mV
(0.007% + 4 counts)
Dc voltage
2
V
(0.004% + 3 counts)
20
V
(0.005% + 3 counts)
200
V
(0.005% + 3 counts)
1000
V
(0.005% + 3 counts)