PM6685R Ver la hoja de datos (PDF) - Unspecified

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PM6685R

Universal Frequency Counter Rubidium Frequency Counter Calibrator

Unspecified 

®

Measuring

function

Frequency

Period

Ratio f1/f2

Pulse Width

(Auto Trigger)

Duty Factor

Random Uncertainty rms

Systematic Uncertainty

LSD Displayed

√(250ps)2 + (Trigger Error)2

±

x Freq. or Period

Measuring Time

√(Prescaler Factor)2+ (f1 x Trigger Error of f2)2

±

f2 x Measuring Time

± √(250 ps)2+(Trigger Error)2

± √(250 ps)2+(Trigger Error)2 x Frequency

± Time Base Error x Freq. or Period

250ps x Freq. or Period

Measuring Time

± QE x Freq. or Period

Measuring Time

Prescaler Factor

f2 x Measuring Time

± Time Base Error x Pulse Width

± 0.5 x Transition Time ± 1.5 ns

± (0.5 x Transition Time ± 1.5 ns)

x Frequency

100 ps

1 x 10-6

Table 1. Measurement Uncertainties and LSD Displayed

Random Uncertainty

Random uncertainty is due to quantization error, short-term Time

Base stability, internal noise and input signal noise. The random

uncertainty can be reduced by increasing the measurement time.

Trigger Error: Internal noise and input signal noise, expressed as

an rms Trigger Error.

Trigger Error =

1.4 x √(eamp)2 + (en)2

Signal slew rate (V/s)

at trigger point

Where:

eamp = rms input amplifier noise (250 µV rms typical)

en = rms noise of the input signal over a 300 MHz bandwidth

Systematic Uncertainty

See crystal oscillator specifications for aging and possible

frequency deviation due to the oscillator’s temperature

dependency

LSD Displayed

Unit value of Least Significant Digit (LSD) displayed. After

calculation, the LSD value is rounded to the nearest decade

before display (for example >0.5 Hz will be 1 Hz and <0.5 Hz

will be 0.1 Hz). LSD blanking is available to reduce displayed

resolution. Measuring times >1s can give significance in > 10

digits. The 11th and 12th digits can be displayed using the

display overflow function.

Options

Battery Unit (Option PM 9623)

The PM 9623 is a rechargeable battery unit for mounting inside

the counter.

Battery Type:

Sealed lead-acid cells

Battery Capacity:

At 25C

Standby Mode:

Typically 20 hours with

Oven Time Base

Operating Mode:

Typically 3 hours without

options, 2.5 hours with Oven

Time Base, and 2 hours with

Oven Time Base and Input C

Recharge Time:

Battery Protection:

External DC:

Line Failure

Protection:

Temperature

Operating:

Storage:

Weight:

Typically 8 hours in

standby mode

Overcharge and deep

discharge protection

12V to 24V via socket on rear

panel (16V to 24V to charge

internal battery)

Counter automatically switches

to internal battery or external

dc when the line voltage falls

below 90V ac

0°C to +40°C

-40°C to +50°C

1.5 kg (3.3 lb)

GPIB (Option PM 9626/02)

Programmable

All front panel and

Functions:

AUX MENU functions

Compatibility:

IEEE 488.2-1987, SCPI 1991.0

Interface Functions: SH1, AH1, T6, L4, SR1, RL1,

DC1, DT1, E2

Maximum

200 to 1600 readings/s,

Measurement Rate

depending on measurement

to Internal Memory: function and internal data format

Internal

764 to 2600 readings,

Memory Size:

depending on measurement

function and internal data format

Maximum Bus

150 to 1000 readings/s,

Transfer Rate from

depending on internal data

internal memory:

format and output data format

Data Output Format: ASCII, IEEE double

precision floating point

Time Out:

Off or 100 ms to 25.5s in

100 ms steps

Analog Output:

0 to 4.98V in 20 mV steps,

derived from three consecutive

digits selected from the

measurement result

Output Impedance:

200Ω

4

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