• Frequency range 20 KHz to 1 GHz
• Useful readings upto 1.5 GHz
• True rms or average response
• Measurement range 1mV to 3V (upto 300V
with 100:1 divider)
• High sensitivity auto ranging or
manual operation
• Mains or external DC operation
• Compact and light weight

RF Millivoltmeter 3145 has been designed to provide accurate RF level measurements from 20 kHz to 1 GHz. It has useful response from 10 kHz to 1.5 GHz and measures RF voltages from 1mV to 3V F.S. in eight ranges. Linear dB scale from -60 to +23 dBm complements volts scale. It is suitable for RF voltage measurements of broad band amplifiers, oscillators & filters with minimum measuring errors as low capacitive and high resistive probe minimise de-tuning and unwanted phase shifts in feed back networks. It can be operated in automode for unknown voltages or the measurement range can be selected manually.

Specifications

• Frequency Range : 20 KHz to 1GHz
• Voltage Ranges : 1 mV to 3 V FS, Selectable
• Display : Analog Meter
• Resolution : 0.5 dBm
db scale - 0.5 dBm
mv scale - 2% of FS measured in Top Black scale
3.3% of FS measured in Bottom Black scale
• Range Selection : Auto or Manual
• Voltage Accuracy : Basic Accuracy + Frequency Response
(<1Vrms input) with Tee adaptor
and 50 ohms load)
• Basic Accuracy : + 2% FS at 25 Deg. C
at 100 MHz

• Frequency Response : + 2% FS (200 KHz to 200 MHz)
+ 5% FS (50 KHz to 500 MHz)
+ 11% FS (20 KHz to 1 GHz)
• Temperature Coefficient : + 0.2% FS per Deg. C
• Crest Factor : 4.2 to 1.4
• Input Impedance : > 100 Kohms in parallel with
2.5 pf (typical)
• Logarithmic Range : + 10 to -30 dBm. 50 Ohms
in a single four decade
dB scale.

• Pen Recorder Output : Available from rear
panel programme socket.
FS equals 1 V nominal
Output Impedance 2 Kohms
• Remote Programming : Range selected by BCD
code, TTL leveLs.
negative logic.

General

 Power requirement : 230 V AC + 10%
• Frequency : 5OHz +10%
• External DC : + 15 V to + 30 V, 200 mA
via rear panel connector
• Operating Temperature : 0 to 55 °C
• Dimensions (Approx.) : (H x W x D)
: 95 x 235 x 275 mm
• Weight (Approx.) : 3.3 Kg.
• Accessories (supplied) : 50 Ohms Tee Connector and 50 Ohms Termination, Mains Lead, Probe earthing Clip, Operating Manual
• Accessories : 100:1 Divider, BNC to Probe Adaptor, 75 Ohms Tee
(Optional) Connector, 75 Ohms Termination