763940

Fluke 8808A Manual

97
Zoom out
Zoom in
Previous page
1/100
Next page
Appendices
Applications A
A-7
Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements
Meas.
Function Range Slow Med Fast
D All 1.2 1.0 0.9
A All 1.0 0.85 0.8
E All 1.2 1.0 0.9
B All 1.0 0.85 0.8
O N/A N/A N/A N/A
G N/A N/A N/A N/A
F N/A N/A N/A N/A
External Trigger
The external trigger can be used with or without settling delays, as shown in Table A-4.
(Refer to Table 4-3 for trigger types.) The amount of trigger delay varies depending on
differences between the primary and secondary displays, as described in the previous
section.
When external trigger is enabled, the meter determines the ranges for the primary and
secondary (if enabled) displays based on the input at that time. The meter is then ready to
begin measuring the input on the optimum range as soon as the trigger is received. If the
input changes so that either display autoranges after the trigger is received, the
autoranging response times (as shown in Table A-3) may be required before each
measurement result is displayed.
The rear panel trigger input is edge sensitive. A low to high pulse (above +3 V) will be
recognized as a trigger less than 3 ms.
Thermal Voltages
Thermal voltages are the thermovoltaic potentials generated at the junction between
dissimilar metals. Thermal voltages typically occur at binding posts and can be greater
than 1 μV. When making low-level dc measurements, thermal voltages can present an
additional source of error.
Thermal voltages can also cause problems in the low ohms ranges. Some low-value
resistors are constructed with dissimilar metals. Just handling such resistors can cause
thermal voltages large enough to introduce measurement errors.
Use the following techniques to reduce the effect of thermal voltages:
1. Use similar metals for connections wherever possible (e.g., copper-to-copper, gold-
to-gold, etc.).
2. Use tight connections.
3. Use clean connection (especially free of grease and dirt).
4. Use caution when handling the circuit under test.
5. Wait for the circuit to reach thermal equilibrium. (Thermal voltages are generated
only where there is a temperature gradient.)
… 97 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Fluke 8808A at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Fluke 8808A in the language / languages: English as an attachment in your email.

The manual is 1,96 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Fluke 8808A

Fluke 8808A User Manual - German - 102 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info