TB 9-6625-2213-24
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Vector Voltmeter, ME-512/U and Hewlett-Packard, Models 8405A and
8405A-H16. The manufacturers' manuals and TM 11-6625-2856-14 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. Hewlett-Packard, Model 8405A, serial number 946 tolerances
(if different) will be in parenthesis.
b. Time and Technique. The time required for this calibration is approximately 3
hours, using the microwave 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.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
Isolation between channels
Frequency range:
1 to
400 MHz: >100 dB
400 to 1000 MHz: >75 dB
(Frequency range:
1 to
300 MHz: >100 dB
300 to 1000 MHz: >80 dB)
Voltmeter residual noise: 10 V or less as indicated on voltmeter
Voltage range: 300 V to 1 V rms1
Voltmeter
Accuracy
Frequency range
(MHz)
( FS)
2
1
to
100
4
100 MHz only
8
101
to
400
(6)
(100
to
300)
(12)
(300
to
800)
1000)1
(12)
(800
to
1000)2
(17)
(800
to
14
400
to
1000
Voltage ratio:
Attenuation range: 0 to 10 dB
Accuracy: 2% of full scale ( 0.2 dB)
See footnotes at end of table.
