Fully Featured
Two versions of the CPM are available, CPM 20 measures frequencies
from 10 MHz to 20 GHz and CPM 46 from 10 MHz to 46 GHz,
through a single input. Power sensors cover the frequency range 30
kHz to 46 GHz, and when used with a CPM measure -60 dBm to +44
dBm (25 W).
The frequency counter has relative frequency and frequency offset
modes for frequency drift and frequency conversion measurements.
A limits function enables frequency to be measured against a specification,
with pass/fail annunciator in the display. Resolution is user
settable from 1 Hz to 1 MHz.
The
power meter features pass/fail limits, dB rel, power offset and
duty cycle modes. An analog peaking meter is displayed for tuning
and adjusting power levels.
A built-in DVM complements the frequency counter and power
meter. Radio links are often aligned by monitoring the receiver AGC
voltage. The DVM, with its clear 10 mV resolution readout and analog
peaking meter, is ideally suited to this task.
SPECIFICATION
FREQUENCY MEASUREMENT
Frequency Range
10 MHz to 20 GHz CPM 20
10 MHz to 46 GHz CPM 46
Sensitivity
10 MHz to 20 GHz -20 dBm (typ, below 20 MHz)
20 GHz to 26.5 GHz -20 dBm
26.5 GHz to 40 GHz -15 dBm
40 GHz to 46 GHz -10 dBm
Input Connector
Precision Type N (f) CPM 20
Precision 2.92 mm (f) CPM 46
Input Impedance
50 Ù Nominal
Maximum Input
10 MHz to 46 GHz +10 dBm (typ, below 20 MHz)
Damage Level
+27 dBm
Resolution
User selectable 1 Hz to 1 MHz
Measurement Time
1 Hz Resolution <2 s
>1 Hz Resolution <250 ms
FM Tolerance
20 MHz peak to peak, for >1 kHz rate
AM Tolerance
Any index as long as minimum level does not fall below sensitivity, at
20 kHz rate
Amplitude Discrimination
20 dB for signals >400 MHz
Accuracy (1 Hz Resolution)
Frequency standard error ±25 Hz
(10 MHz to 20 GHz)
Frequency standard error ±50 Hz
(20 GHz to 46 GHz)
Features
Limit checking, Relative frequency, Frequency offset, Frequency hold
10 MHz FREQUENCY STANDARD
Temperature Stability
DTCXO (standard)
Better than ±5 in 108, 0 to 50°C
TCXO (option 001)
Better than ±1 in 106, 0 to 50°C
Ageing
DTCXO (standard) ±0.3 ppm/year
TCXO (option 001) ± 1ppm/year
External Frequency Standard Input
10 MHz, 0.7 to 5 V p-p sine or square wave into 1 kÙ nominal.
AC coupled. BNC female
POWER MEASUREMENT
Frequency Range (Sensor Dependent)
30 kHz to 46 GHz
Power Range (Sensor Dependent)
-65 dBm (0.31 nW) to +44 dBm (25 W)
Power Sensors Supported
6910 series (-30 dBm to +20 dBm)
6920 series (-65 dBm to -20 dBm)*
6930 series (-15 dBm to +35 dBm)
6930 series opt 2, (-5 dBm to +44 dBm)
Power Accuracy
After calibration using 0 dBm, 50 MHz power reference: ±0.2 dB
measuring a 50 MHz signal in the centre of the power sensor dynamic
range, from a source with a return better than 14 dB
Resolution
4 digits
Units
dBm, dBW, pW, nW, ìW, mW, W, kW
Features
Limit checking, Duty cycle, dB Relative, Power offset,
Analog Meter
Correction
Linearity Factor
Calibration Factor
Auto-Calibration
Ability to calibrate against a 0 dBm (1 mW), 50 MHz power reference
Auto-Zero
Removes DC offset from gain stages and power sensor.
