TB 9-6625-1942-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Voltmeter, Hewlett-Packard, Model 3490A with probes K24-3490A
and K25-3490A. The manufacturer's manual was used as the prime data source in
compiling these instructions. The equipment being calibrated will be referred to as the TI
(test instrument) throughout this bulletin.
a. Model Variations. Variations among models are described in the text.
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. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance applications which pertain
Test instrument
parameters
Performance specifications
Range: 0 to 1000 V in 5 ranges (probes 0 to 10,000 V) 1
Dc voltage:
Accuracy:
0.1 V range: (0.013% of reading + 0.005% of range)
1 V range and above: (0.013% of reading + 0.002% of range) (probes 0.5%)2
Ac voltage:
Range : 0 to 1000 V in 4 ranges, 20 Hz to 250 kHz
Accuracy : 20 to 50 Hz, (0.4% of reading 0.06% of range)
(K25-3490A probe 0.5% at 1000 V, 20 to 100 Hz)
50 Hz to 100 kHz, (0.1% of reading 0.03% of range)
(K25-3490A probe 5.0% at 1000 V, 100 to 400 Hz)
100 to 250 kHz, (0.75% of reading 0.07% of range (on 1 and 10 V ranges only)
See footnotes at end of table.