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TB 9-6625-1996-35
2
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Frequency Counter, Hewlett-Packard, Models 5345A, 5345A/E28 and
5345AOPT12. The manufacturer's 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. Differences among models are listed within 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 to this calibration are in table 1.
Table 1. Calibration Description
Test instrument parameters Performance specifications
Time base:
Frequency: 10 MHz
Aging rate (after 24 hour warmup): < 5 x 10
-10
per day
Line voltage variation
(for 10% variation): <1 x 10
-10
15 minutes after change
Channel A and B sensitivity: Separate inputs:
25 mV rms: dc to 500 MHz (dc coupled)
Common inputs:
50 mV rms: dc to 400 MHz (dc coupled)
A12 interface I/O Range: -2 to +2 V dc
Accuracy: ±0.0005 V dc