iL Series User Manual
58
Rev B
California Instruments
6. Calibration and performance verification
.
IMPORTANT Perform the verification procedures before calibrating your AC source.
If the AC source passes the verification procedures, the unit is
operating within its calibration limits and does not need to be
recalibrated.
WARNING:
LETHAL VOLTAGES AC sources can supply 424 V
peak at their output. DEATH on contact may result if the output
terminals or circuits connected to the output are touched when power
is applied. These procedures must be performed by a qualified
electronics technician or engineer trained on this equipment.
6.1 Equipment Required
The equipment listed in the following table, or the equivalent to this equipment, is
required for verification and calibration.
Equipment Required
Description
Digital Voltmeter:
Resolution: 10 nV @ 1 V
Readout: 8.5 digits
Accuracy: <20 ppm
Example: HP 3458A
Current Monitor:
The 4- terminal current shunt is used to
eliminate output current measurement error
caused by voltage drops in the load leads and
connections. It has special current-monitoring
terminals inside the load connection terminals.
Connect the voltmeter directly to these current-
monitoring terminals.
0.01
Ω
, 200 ppm, 10 W Guildline 7320/0.01
Load Resistor:
15
Ω
, 1.5 kW min (3000iL & 4500iL),
4.7
Ω
, 4.8 kW min (4801iL).
Impedance Resistor:
1
Ω
, 100 W min (4801iL only).
Ratio transformer:
A ratio transformer is required only when
verifying output voltage readback to MIL-STD-
45662A 4:1 test equipment ratio requirements.
30:1 ratio, <50ppm
IEEE-488 Controller:
PC with National Instruments IEEE-488
controller card
Table 38 : Required Calibration equipment
Figure 19 shows the setup for the tests. Be certain to use load leads of sufficient
wire gauge to carry the full output current (see section 2.7.2).
Summary of Contents for iL Series
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