TB 9-6625-1924-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Multimeter, Agilent Models 427A and 427A Opt 01. 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. Model 427A option 01 contains battery operation and ac line
operation. Model 427A is battery operated. Other variations are described in text.
b. Time and Technique. The time required for this calibration is approximately 4
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 specifications which
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Dc voltage
Range: 100 mV to 1000 v
Accuracy: 2 % full scale
Ac voltage
Range: 10 mV to 300 V
Accuracy: 2 % FS
Range: 10 Hz to 1 MHz (10 mV to 30 V)
10 Hz to 100 kHz (100 V to 300 V)
Accuracy: 2 % FS
Range: 10 ohms to 10 megohms
Accuracy: 5% of reading at midscale
Ac rejection
Superimposed peak ac voltages (60 Hz and above)
100 times greater than FS affects reading less
than 1 %. Max 450 v peak.
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment used in this
calibration procedure. This equipment is issued with the Secondary Transfer Calibration
Standards Set AN/GSM-286, AN/GSM-287 or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily