TB 9-6625-388-24
Test instrument parameters
Performance specifications
Leeds and Northrop Models 5300, 5305, and 5430AM1
Ratio
Enclosed dial switch having even multiplying values: 0.001, 0.01, 0.1, 1,
10, 100, and 1000
Rheostat
Four decades 9 (1 + 10 + 100 + 1000) ohms
0.1% for 10-, 100-, and 1000-ohm steps; 0.25% for 1-ohm step
Decade accuracy
(0.15% + 0.01 ohm)
Bridge error
(Models 5300, 5305, and 5430AM1)
0.05%
Ratio accuracy
Current rating max
1-ohm decade, 0.7A; 10-ohm decade, 0.22 A; 100-ohm decade, 0.07A;
1000-ohm decade, 0.022A
1
Galvanometer
Sensitivity: 1 A per scale division
Power requirement
4.5V (3 type-D flashlight cells)
Models ZM-4( )/U
Power requirements:1
Internal: 4.5 V dc (3 D cell batteries)
External: 22.5 to 200 V dc (40 ohms per V) current limiting resistor
must be used for voltages in excess of 45 V
A
Range: 1 ohm to 1.011 M
ccuracy: 0.25% for ZM-4A/U and ZM-4B/U on orders 19629-P-50
and 6870-P-51
Range: 0 to 1.011 k
(0.1% +0.01 ohm)
Current limitations: 0.016 to 0.5 A
1This
specification is for information only and is not verified in this bulletin.
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 3 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Standards Sets
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 prior to use and must
bear evidence of current calibration. The equipment must meet or exceed the minimum use
specifications listed in table 3. The accuracies listed in table 3 provide a four-to-one ratio
between the standard and TI. Where the four-to-one ratio cannot be met, the four-to-one
accuracy of the equipment selected is shown in parenthesis.
5. Accessories Required. The accessories required for this calibration are common usage
accessories, issued as indicated in paragraph 4 above, and are not listed in this calibration
procedure. The following peculiar accessory is also required for this calibration: DC Power
Supply, MIS 38956.
Table 3. Minimum Specifications of Equipment Required
Minimum use
Manufacturer, model, and
Common name
specifications
part number
Range: 1 to 900,000 ohms
Biddle-Gray, Model 71-631
DECADE
Accuracy: 0.03%
1
(7910328)
RESISTOR
Range: 1 to 1 Gohm
Agilent, Model 3458A
Accuracy: 0.03%
(3458A)
1Two required (designated decade A and B, as applicable).