AM Tolerance: 98%, minimum signal must exceed mini-
mum operating input voltage requirement
Impedance:
50Ω nominal, VSWR <2:1
Maximum Voltage Without Damage: 12 V
RMS
, over-
load protection with PIN diodes.
Ext Reference Input
The input automatically detects when a suitable external
reference signal is connected. The use of an external ref-
erence signal is indicated on the display.
Input Frequency:
10 MHz ±0.1 MHz
Coupling: AC
Sensitivity: 500 mV
RMS
Input Impedance:
approx. 300Ω at 10 MHz
Max Input Voltage: 15 V
RMS
General Information
Power Requirements
Line Voltage: 115 or 230 V
RMS
15%;
46 to 440 Hz, (<20 VA incl. all options).
Safety: in accordance with IEC publication 1010-1, and
CSA 22.2 No.231.
Line Interference: below VDE 0871 B and MIL STD
461.
Battery Unit: See PM 9605 option.
Dimensions and Weight
Width:
186 mm
Height:
88 mm
Depth:
270 mm
Weight,
net: 2.1 kg, shipping:3.0 kg
Cabinet: The counter is housed in a metal cabinet, to
minimize electro-magnetic interference and achieve
good mechanical stability.
Environmental Conditions
Temperature,
Operating:
0°C to +50°C
Storing:
-40°C to +70°C
Altitude,
Operating:
5000 m (53.3 kN/m
2
)
Storing:
15000 m (15.2 kN/m
2
)
Humidity,
Operating:
10% to 90% RH, no condensation
Storing:
5% to 95% RH
Vibration Test: According to IEC 68Fc
Bump Test: According to IEC 68Eb
Handling Test: According to IEC 68Ec
Display
Read Out: 9 digit LCD display with unit indication.
Unit Indication:
MHz, kHz, Hz, mHz, ks, s, ms, µs, ns,
M, k, m, µ,and n.
GATE Indicator: Indicates that the counter is busy
measuring.
REMOTE Indicator: Indicates when control over the
counter is taken over by an installed GPIB interface
PM 9604.
Cursor: Indicates selected measuring function, selected
Measuring-time, input triggering, display hold and
whether an external reference frequency is in use.
Time Base (Crystal Oscillator)
Choice of:
–
Uncompensated crystal oscillator (order no
PM 6669/.1.)
– MTCXO, i.e. Mathematically Temperature Compen-
sated Crystal Oscillator (order no PM 6669/.3.). The
MTCXO can be ordered separately for later upgrading
of the counter (option PM 9607).
MTCXO Working Principle: The temperature of the
crystal is measured. The built-in microprocessor calcu-
lates the frequency deviation for that particular tempera-
ture from a stored table. The measuring result is mathe-
SPECIFICATIONS Page: 37
PM 6669 - OPERATORS MANUAL
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