TB 9-6625-177-24
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Radio Frequency Power Test Set, AN/URM-213. TM 11-6625-3276-14&P and
the manufacturer's manual were 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 1
hour for wattmeter mainframe and 1 hour for each plug-in element using the dc and low
frequency and microwave frequency techniques.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
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
Wattmeter mainframe
Audio frequency range: 900 to 1100 Hz
Accuracy
Factor
(%FS)
100
1
30
1
10
1
3
1
1
1
0.3
1.5
0.1
1.5
Plug-in element 4410-2
Frequency range: 450 kHz to 2.5 MHz
Power range: 0 to 10000 watts
Accuracy: 5% of reading above 20% of full scale of the power range
Plug-in element 4410-4
Frequency range: 2 to 30 MHz
Power range: 0 to 10000 watts
Accuracy: 5% of reading above 20% of full scale of power range
Plug-in element 4410-5
Frequency range: 25 to 80 MHz
Power range: 0 to 1000 watts
Accuracy: 5% of reading above 20% of full scale of power range
Plug-in element 4410-6
Frequency range: 50 to 200 MHz
Power range: 0 to 1000 watts
Accuracy: 5% of reading above 20% of full scale of power range
Plug-in element 4410-8
Frequency range: 200 to 1000 MHz
Power range: 0 to 1000 watts
Accuracy: 5% of reading above 20% of full scale of power range
Dummy load
Frequency range: 450 kHz to 1000 MHz
Voltage Standing-Wave Ratio: 1.10:1 (max)