Off: Signal below set trigger level.
Blinking: Triggering occurs.
Input Channel Selection:
Separate A and B,
or A and B common via input-A.
Input C
(Option PM 9608B)
Frequency Range:
70 MHz to 1.3 GHz
Coupling:
AC
Operating Input Voltage Range:
10 mVrms to
12Vrms, 70 MHz to 900 MHz; 15 mVrms to 12Vrms, 900
MHz to 1100 MHz; 40 mVrms to 12Vrms, 1100 MHz to
1300 MHz
AM Tolerance:
94% at max 100 kHz modulation fre-
quency; minimum signal must exceed minimum operating
input voltage requirement
Input Impedance:
50
Ω
nominal, VSWR :1
Max Voltage Without Damage:
12V rms, overload
protection with pin diodes
External Reference Input D
Input Frequency:
10 MHz ± 0.1 MHz
Coupling:
AC
Sensitivity:
500 mV rms
Input Impedance:
Approx 300
Ω
at 10 MHz
Maximum Input Voltage:
15Vrms
Auxiliary Functions
Power On/off
Switches counter power on/off. At power up a self-test is
made and the counter is set to default settings.
Default Settings
Function: FREQ A
Measuring-Time: 0.2 s
Coupling: AC on Input-A, DC on Input-B
Trigger level: Auto
Trigger slope: Positive on A and B.
RESET
The RESET button has three functions:
RESET: Starts a new measurement. The settings are not
changed.
LOCAL:
Makes the counter go to LOCAL operation, when in remote
operation (unless Local Lock-Out is programmed).
START/STOP: Opens/closes the gate in TOTALIZE A,
manual mode.
Measuring Time
A measuring time of 0.2s, 1s, 10s or
SINGLE can be selected
NOTE: When SINGLE is selected together with PERIOD,
RATIO or TIME, the result is a single cycle meas-
urement, but SINGLE together with FREQUEN-
CY results in a fixed 3 ms Measuring-time.
Measuring rate: Approx. 5 measurements/s. Approx. 2
measurements/s when AUTO trigger level is switched on.
Display time: Normally the display time equals the set
Measuring-time. When SINGLE is selected, a display time
of 0.1 seconds is used.
Display Hold
The current measuring result is frozen on
the display. A new measurement starts when the RESET
button is pressed.
Definitions
LSD Displayed
LSD = unit value of the least significant digit displayed. All
calculated LSDs (see Measuring Functions section)
should be rounded to the nearest decade (e.g., 0.3 Hz is
rounded to 0.1 Hz and 5 Hz to 10 Hz) and cannot exceed
the 9th digit.
Resolution
Resolution = smallest increment between two measuring
results on the display, due to the ±1 count error.
Freq A, Freq C, Period A:
Resolution can be 1 LSD or 2 LSD if:
the resolution is 2 LSD units (30% probability). Otherwise
resolution is 1 LSD unit (70% probability).
Ratio A/B:
Resolution can be 1 LSD or 2 LSD. If:
the resolution is 2 LSD units (30% probability). Otherwise
resolution is I LSD unit (70% probability).
SINGLE Period A and SINGLE Ratio A/B:
Resolu-
tion equals 1 LSD unit
Time A-B:
Resolution (95% confidence level) equals 1
LSD unit or 100 ns/N, whichever is greater
LSD
measuring time
FREQ or PERIOD
×
<
−
10
7
LSD
measuring time
RATIO
FREQ A
×
<
10
SPECIFICATIONS
Page: 39
PM 6666 - OPERATORS MANUAL
