TB 9-6625-2250-24
Table 1. Calibration Description - Continued
Test instrument parameters
Performance specifications
Marker amplitude accuracy
Measured at 300 MHz
Accuracy (< dB)
Reference levels (dBm)
0
3.3
-10
3.3
-40
3.3
-50
3.3
1Limited
to 18.0 GHz due to N type input connector.
2N
3Procedure limits of 5 GHz
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set 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 prior to
use and must bear evidence of current calibration. The equipment must meet or exceed the
minimum use specifications listed in table 2. The accuracies listed in table 2 provide a four-
to-one ratio between the standard and TI.
5. Accessories Required. The accessories required for this calibration are common
usage accessories issued as indicated in 4 above and are not listed in this calibration
procedure.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
Weinschel, Model 9918-6 dB (9918-6 dB),
ATTENUATOR
6 dB:
Model 9918-10 dB (9918-10 dB) and Model
(FIXED)
9918-20dB (9918-20 dB)
Accuracy: 0.3 dB
10 dB:
Accuracy: 0.5 dB
20 dB:
Accuracy: 0.5 dB
ATTENUATOR NO. 1
Range: 0 to 12 dB
Hewlett-Packard, Model 355C (7910807)
Frequency: 50 MHz
Hewlett-Packard, Model 355D (355D)
ATTENUATOR NO. 2
Range: 0 to 60 dB
Frequency: 300 MHz
Accuracy with correction report:
0.825 dB