381235 Ver. 1.5 3/01
3
Front Panel Description
1. Channel A input
2. Ch. B input
3. Ch. C input
4. LCD display 8-digits
5. AC adapter jack (side)
6. Resolution key
7. Relative mode key
8. Data Hold key
9. Power ON key
10. Record mode key
11. Call mode key
12. Range select switch
13. Power OFF key
14. Gate time selecter switch
15. Sensitivity key
NOTE:
Battery compartment is on lower
rear of meter secured by two screws
Operation
RF Antennae and Measurement Probes
The female BNC input sockets on the top of the meter accept RF Antennae or Direct
Measurement Probes with BNC connectors. These are optionally available through Extech
Instruments. Connect the RF Antennae or Direct Probes before powering the meter. It is
recommended that only RF Antennae be used for frequencies greater than 500MHz for
the best sensitivity.
Frequency measurements
1. Press the
Power ON
key to power the meter. If the display does not indicate digits
check the batteries or the AC adapter. To power down press the
Power OFF
key
2. Slide the
Range selector switch
to desired measurement range. Note that for the best
accuracy and resolution, be sure to use the most appropriate range.
3. Apply the measurement signal to the input
Channel A socket
if the frequency of the
signal is between 500MHz and 2500MHz.
4. Apply the measurement signal to the input
Channel B socket
if the frequency of the
signal is between 10MHz and 500MHz.
5. Apply the measurement signal to the input
Channel C socket
if the frequency of the
signal is less than 10MHz.
6. Slide the
Sensitivity selector switch(es)
to the HIGH or LOW setting if the measured
signal is less than 10MHz.
7. Slide the
Gate select switch
to the FAST or SLOW setting depending upon the desired
resolution and sampling rate (refer to the specifications section).
Note
that if SLOW is
selected, pressing the RESO key (up to 3 times) scrolls through up to 3
resolution/sampling rate display combinations. Press the RESO key and observe the
LCD each time for the different resolution/sampling rate combinations. The LCD flashes
at the sampling rate selected.
8. The units for the 500/2500MHz ranges is MHz and the units for the 10HMz range is Hz.
