Chapter 7 HP 53131A/132A Specifications

Time Base

Time Base

Internal Time Base Stability

 

 

 

 

Standard

Medium Stability

High Stability Oven

Ultra High Stability

 

 

 

 

(0° to 50°C)

Oven (Option 001)

(Option 010)

Oven (Option 012)

 

 

 

 

 

 

 

 

 

 

 

 

Temperature Stability:

 

< 5 x 10–6

< 2 x 10–7

< 2.5 x 10–9

< 2.5 x 10–9

 

 

(referenced to 25°C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Aging Rate

Per Day:

< 3 x 10–7

< 4 x 10–8

<

5 x 10–10

<

1 x 10–10

 

 

 

 

(after 30 days)

Per Month:

< 2 x 10–7

< 1.5 x 10–8

<

3 x 10–9

 

 

Per Year:

 

 

 

 

<

2 x 10–8

 

 

 

 

 

 

 

7

 

Turn-on stability vs. time:

 

 

< 2 x 10–7

<

5 x 10–9

<

5 x 10–9

 

(in 30 minutes)

 

 

(referenced to 2 hours)

(referenced to 24 hours)

(referenced to 24 hours)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Calibration:

 

Manual Adjust

Electronic

 

Electronic

 

Electronic

 

 

 

 

 

 

 

 

 

 

Note that power to the time base is maintained when the counter is placed in standby via the front panel switch. The internal fan will continue to operate under this condition, to maintain long-term instrument reliability.

External Time Base Input Specifications

External Time Base Input Characteristics

Voltage Range:

200 mVrms to 10 Vrms

Threshold:

 

0 V

Damage Level:

10 Vrms

Impedance:

 

1 kΩ

 

 

Input Capacitance:

23 pF

 

 

Frequency (53131A):

1 MHz, 5 MHz or 10 MHz

 

 

 

 

(automatic selection)

 

 

Frequency (53132A):

10 MHz

 

 

Internal vs. External Time Base Selection:

 

 

Manual:

Select Internal or External

 

 

Automatic:

Internal used when External not present

 

 

 

(default)

 

 

 

 

 

Time Base Output Specifications

 

 

 

Output Frequency:

10 MHz

 

 

 

Voltage:

> 1 Vpp into 50 Ω

 

 

 

(centered around 0 V)

7-4

Assembly-Level Service Guide