Tenma 72-7390 Quick Start Manual

72-7390
Smart
R.F.
Counter
lntroduqtion
The
Tenma
72-7390 hand-held radio frequency counter is
ccrmpact, truty
pocfet-sized, versatile test instrument designed
for
measuring
any
digital,.
on/off keying or analog signal on frequencies between 30
MHz
and
2.8 GHz.
Supplied
Ls
a
ccmplete with internal rechargeable battery
pack,
AC wall chbrger and
7
section telescopic
antenna"
$pecifications
lmpedance:
Frequency
range:
Sensitivity:
Max.
input:
Resolution:
Timebase:
Weight:
Size:
Case:
Battery:
Power:
50 Ohms (BNC Socke|
VSWR
less
than
2:1
30 MHz
- 2.8 GHz
less
than 5 mV
15 dBm
10 KHz for digital Signals or On/Off Keying
1 KHz forAnalog Signals
Less
than
1
PPM at
room temperature
210 g
80 mm
high
x 68 mm wide x 31 mm deep
Stamped aluminum with black anodized finish
lnternal
4 x
AA 600 mAH rechargeable battery
pack
I
VDC 300 mA
t
o
a
a
a
a
a
a
a
a
')
4
f-eatures-
7
digit Liquid Crystal
Disptay
Frequency counter fordigital,
on/off keying and analcg signals
with
a
minimum pulse
width
of
250
uS.
Ultra sensitive synchronous detector -
16 section bargraph to show
RF
signal sfrength (-35dBm
to
0 dBm)
Two range positions
-
_t!" t. GHz position for frequencies between 30
MHt and
1
GHz
and
the 2.g GHz position for
frequencies between 500 MHz
and
2.8
GHz.
Squelch adjustment
for input signals
Hold switch to lock display
Low battery indicator
Vibrating alert
Low power
consumption (Average
5
hour
bat$ery
life)
Supplied with rechargeable battery
pack.
AC wall charger
and telescopic antenna (143 MHz
to 460 MHz)
SQL Knob
- This
knob turns
the RF counter on and tunes the squelch up or down to set the signal
strength for
reception.
Range Switch
- This should be
switched to the
1 GHz position for frequencies between
30 MHz and 0.8 GHz
and
switched to the 2.8 GHz position for frequencies between 500 MHz
and
2.9
GHz.
Hold Bufton
- This holds the current display
and
stops the counter from counting.
Calibration
- The calibration
adjustment opening
is
located on the front panel of the counter.
This
allows access
to
the
trimmer capacilorthat
provides about
a
10 PPM adjustment range
of
the time base oscillator. This is not
usually
necessary but
to do so
read a
signal
of a
known frequency before adjusting
the trimmer for correct
frequency
display. lf you calibrate at 4.1943 MHz
or above then the counter will
be more accurate.
Warrantv
Tenma
Test Equipment guarantees
the RF counter and its accessories for one year against defects in manufacture. This
warranty does not cover items that have been modified, subject
to
unauthorized repairs, misuse or abuse. This warranty
does not cover damage caused by excessive power levels applied to
the signal input.
Never make any
kind of connection
between the RF counter and a transmitter.