ET 71 / ET 91 Comparisons:
General Data
Construction
Application
Dimensions
Weight
ET 71 A / ET 71 V / ETM 4
Generator, Receiver, Bridge separate
Up to 120 FDM channels
ET 70 A: 350x220x200 mm
ET 70 V: 350x220x200 mm
ETM 4: 120x120x40 mm
ET 70 A: ~9 kg
ET 70 V: ~9 kg
ETM 4: ~1 kg
Nominal: +5..+45C
Operating: 0..55C
Storage, transport: 40 to +70C
Mains
From internal battery
From car battery
Level display: Galvanometer
Frequency display: digital
ET 91
All of them are in one instrument
Up to 600 FDM channels
224 x 160 x 44 mm
~1.5 kg
USB Interfaces
PC connection is not possible
PC Program
PC connection is not possible
Nominal: 0..+45C
Operating: -5..50C
Storage, transport: 40 to +70C
Mains
From internal NIMH battery
From car battery
Level and frequency display is digital with
320x240 pixel graphic LCD display
Memory locations for test results
Memory locations for setups
USB 1.1 host port for USB stick
USB 1.1 device port for PC connection
PC program for result and setup transfer
ET 71 A / ET 71 V / ETM 4
Provided
Provided
Provided
With external adapter
With external adapter
With external adapter
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
ET 91
Provided
Provided
Provided
Provided
Provided
Provided
Additional Service
Additional Service
Additional Service
Additional Service
Additional Service
Additional Service
Additional Service
Additional Service
ET 71 A
Range: 200 Hz...620 kHz
Accuracy: 2x10-5 1 digit
Resolution: ~1 Hz
Symmetrical and Coax:
0, 75, 135 (125), 150, 600
Balanced: +10 to 50 dBm, dB
Coax: +10 to 50 dBm, dB
Balanced: ~ 0,5 dB
Coax: ~ 0,6 dB
ET 91
Range: 100 Hz... 2.4 MHz
Accuracy: 2x10-6 1 digit
Resolution: 1 Hz
Symmetrical and Coax:
0, 75, 135(125), 150, 600
Balanced: +10 ... 50 dBm, dB
Coax: +10 ... 50 dBm
Balanced: ~ 0,3 dB
Coax: ~ 0,3 dB
Temperature
Power
Display
Memory
Operation Modes
Transmitting
Selective Receiving
Wide band Receiving
Impedance Measurement
Return Loss Measurement
Balance Measurement
Wide band Noise Measurement
Impulse Noise Measurement
Spectrum Analyzer
Master Slave Measurement
Multi Tone Measurement
NEXT/LOSS Measurement
Battery Quick Charge
Battery Regenerative Charge
Parameter
Frequency
Input Impedance
Output Level
Level accuracy
Not available
Parameter
Frequency Range
Band Widths
Terminated Inputs
Unterminated Inputs
Measuring Range
Minimum Readable Level
Measuring Accuracy
ET 71 V
Wideband: 50 Hz... 620 kHz
Selective: 200 Hz...620 kHz
20 Hz, 3.1 kHz
75, 135 (125), 150, 600 5%
Balanced:
300 Hz620 kHz 5 k
10 kHz..300 kHz 8 k
Coax:
3 k 50 pF
Wideband:-60 to +40 dB (With attenuator)
Selective: -90 to +40 dB (With attenuator)
Selective: -120 dB
Wideband: -90 dB
ET 91
Wideband: 100 Hz... 2.4 MHz
Selective: 100 Hz...2.4 MHz
20, 200 Hz, 1.74, 1.95, 3.1 kHz
75, 135 (125), 150, 600 2%
Balanced and Coax:
100 Hz... 2,4 MHz >20 k 30 pF
Balanced Input:
0 dB 20 kHz: 0,3 dB
Coax Input:
0 dB 20 kHz: 0,5 dB
Wideband:-60 to +40 dB (With attenuator)
Selective: -90 to +40 dB (With attenuator)
Selective: -120 dB
Wideband
With 600 kHz filter: -80 dB
With 4 kHz filter: -100 dB
Balanced Input:
0 dB 100 kHz: 0,2 dB
Coax Input:
0 dB 100 kHz: 0,2 dB
In all measuring modes
Auto Ranging
Not provided
Wideband Noise Measurement
Not provided
With 9 selectable filters
Impulse Noise Measurement
Not provided
Spectrum Analyzer
Not provided
Maximum 72 hours
Minimum Readable Level: -140 dBm/Hz
Ranges
2.4 MHz
1.5 MHz
600 kHz
300 kHz
20 kHz
4 kHz
Parameter
Impedance Measurement
Return Loss Measurement
LCL Balance Measurement
ETM - 4
With external adapter
Frequency range:
300 Hz620 kHz
Measuring range:
50 .3000
Accuracy: 10%
With external adapter and
external normal resistance
Frequency range:
300 Hz620 kHz
Measuring range:
60 .1200
Accuracy: 1dB
With external adapter
Frequency range:
300 Hz620 kHz
Measuring range:
0.40 dB
Accuracy: 1dB
ET - 91
With built in bridge
With built in bridge and
Internal normal resistance
Frequency range:
200 Hz... 2,4 MHz
Measuring range:
60 .1200
Accuracy: 1dB
With built in bridge
Frequency range:
200 Hz... 2,4 MHz
Measuring range:
0.40 dB
Accuracy: 1dB
