ETS-Lindgren HI-1710 Microwave Measurement System (Archived) - Manual (Page 25)

Page — 20 HI n 1710 Manual
Graph display is not filtered and responds very rapidly to
changes in RF intensity. The Peak Hold mode may be
used, while scanning, to capture the area of highest
leakage while the Bar Graph will continuously display
instantaneous variations in leakage.
Changing the filter selection to F2 will decrease the
response time of the system. This will more effectively
show the effect of rapid variations in RF levels due to
mode stirrers or other modulating devices. In both the F1
and F2 filter positions, the response time meets the
CDRH (US Government) requirement for RF measuring
instrument response times while the F1 response
characteristic provides maximum smoothing of RF
variations.
Note: Do not use filter selection F3 and F4 for US
compliance testing without prior approval of CDRH.
Contact Holaday Industries for further information.
After the test is completed and the RF reading recorded
the instrument should be zeroed by activating the ZERO
switch before the next test. The zero point may
gradually drift over long periods. Re-zero the instrument
before beginning a test.
Analog Output
An analog output is available on the rear panel of the HI-
1710. This is the BNC receptacle just to the right of the
25 pin RS-232 receptacle. The analog output is a dc
voltage varying from zero to four (0-4) volts proportional
to the full scale range setting of the instrument. For
example, with the instrument on range 2 (0-2 mW/cm
2 ),
a leakage value of 2 mW/cm 2 will have an analog signal
of 4 VDC and a 1 mW/cm 2 value will have a signal of 2
VDC. On range 4 (0-10 mW/cm 2 ), the four (4) volt
Archived 4/2/10