TB 9-6625-2227-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Multimeter, Hewlett-Packard, Models 3435A and 3438A. 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. None.
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
to this calibration are in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Dc voltage
Range: 0 to 1200 V in 5 ranges
Accuracy : 200 mV range: (0.1% of reading + 2 digits)
2 V to 1200 V range: (0.1% of reading + 1 digit)
Ac voltage
Range: 0 to 1200 V in 5 ranges
Accuracy: 0 to 50 Hz : (1.5% of reading + 3 digits)
50 to 20 kHz: (0.3% of reading + 3 digits)
20 to 100 kHz: (1.5% of reading + 10 digits)
Range: 0 A to 2000 mA in 5 ranges
Dc current
Accuracy: 200 A to 200 mA range: (0.3% of reading + 2 digits)
200 mA range: (0.6% of reading + 2 digits)
Range: 0 A to 2000 mA in 5 ranges
Ac current 1
200 A to 200 mA:
Accuracy:
30 to 50 Hz: (1.7% of reading + 4 digits)
50 Hz to 10 kHz: (0.9% of reading + 4 digits)
200 mA:
30 to 50 Hz: (2% of reading + 4 digits)
50 to 10 kHz: (1.2% of reading + 4 digits)
Range: 0 to 20 M in 7 ranges
Accuracy: 20 range: (0.5% of reading + 10 digits)
200 to 2 M range: (0.2 % of reading + 2 digits)
20 M range: (0.8% of reading + 2 digits)
1Actual
parameters not tested; checked in dc current mode.
