Newport 1815-C, Руководство оператора

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15
4.2.3 Initial Conditions
Before performing the verification procedures, make sure the Model 1815-C
meets the following environmental criteria:
a. If the instrument has been subject to temperatures either below 18
°
C
(65
°
F) or above 28
°
C (82
°
F), allow sufficient time for the instrument to
reach temperatures within this range. It generally takes one hour to
stabilize a Model 1815-C that is
>
10
°
C (18
°
F) outside of this range.
b. Turn on the Model 1815-C and allow it to warm up for 10 minutes.
4.2.4 Verification Procedures
To properly check the accuracy of the Model 1815-C, a precision current
source and precision function generator are necessary. The precise currents
required are obtained by using a precisely setable current source such as the
Keithley Instruments Model 220 and a precisely setable Voltage Source such as
the Hewlett-Packard 8904A, Function Generator.
W
W
kW
µ
W
µ
W
mW
µ
W
nW
nW
mW
µ
W
µ
W
W 2
200
20
20
200
2
mW
mW
W
(Position 3)
(Position 2)
(Position 1)
(Position 4)
(Position 5)
(Position 6)
Figure 7 — Model 1815-C Range Switch Positions
a. Verifying current measurement performance:
1. Set the Model 1815-C SETUP DIP bank to: 1, 0, 1, 0 for positions 1, 2,
3 and 4 respectively.
2. Set the Range switch to position 1, the highest gain position. See
Figure 7.
3. Press the CAL button and adjust CAL ADJ until the display indicates
1.00 and then release the CAL button.
4. With an open input, use the ZERO knob to adjust the display to 00.00
±
0.05.
5. Connect the Model 1815-C to a current source.
6. Using Table 8 as a guide, set the appropriate output currents listed
and record the resulting Model 1815-C display readings.