598220

Keithley 2001 Manual

51
Zoom out
Zoom in
Previous page
1/476
Next page
Front Panel Operation
2001-900-01 Rev. K/ August 2010 3-19
UNITS
This parameter selects the displayed units for AC voltage
measurements. You can program the ACV units parameter as
follows:
1. From the CONFIGURE ACV menu, select UNITS and
press ENTER. The following menu is displayed:
SET ACV DISP UNITS
VOLTS dB dBm
2. Highlight the desired units and press ENTER.
VOLTS: With volts selected as the units, AC voltage
measurements are expressed in volts.
dB: Expressing AC voltage in dB makes it possible to
compress a large range of measurements into a much smaller
scope. The relationship between dB and voltage is defined
by the following equation:
where:V
IN
is the AC input signal.
V
REF
is the specified voltage reference level.
The instrument will read 0dB when the reference voltage
level is applied to the input. dB measurements are possible
on all ACV measurement types except positive peak spikes
and negative peak spikes, as these may be negative, and the
log of a negative number is not defined. Note that dB
measurements are specified only for the low frequency RMS
measurement type.
If a relative value is in effect when dB is selected, the value
is converted to dB. If a relative value is stored after dB units
are selected, the units of the relative value are dB.
To set the reference voltage level, perform the following
steps:
1. From the SET ACV DISP UNITS menu, select the dB
option. The following typical message is shown:
dB REF LEV:001.000 V
2. By using the cursor keys ( and ) and the RANGE
and keys, you can enter the desired voltage refer-
ence level (0.001V to 750V).
3. Press ENTER to complete the change. If positive peak
spikes or negative peak spikes is the selected AC type,
the change is not allowed.
dBm: dBm is defined as decibels above or below a 1mW
reference. With a user-programmable reference impedance,
the Model 2001 reads 0dBm when the voltage needed to
dissipate 1mW through the reference impedance is applied.
The relationship between dBm, a reference impedance, and
the voltage is defined by the following equation:
where: V
IN
is the AC input signal.
Z
REF
is the specified reference impedance.
NOTE
Do not confuse reference impedance with
input impedance. The input impedance of
the instrument is not modified by the dBm
parameter.
If a relative value is in effect when dBm is selected, the value
is converted to dBm. If a relative value is stored after dB
units are selected, the units of the relative value is dBm.
To set the reference impedance, perform the following steps:
1. From the SET ACV DISP UNITS menu, select the dBm
option. The following menu is shown:
SET dBm REFERENCE
507593132300600
2. Highlight the desired reference impedance and press
ENTER to complete the change. If positive peak spikes
or negative peak spikes is the selected AC type, the
change is not allowed.
dB/dBm notes:
1. dB and dBm units are not allowed with positive or neg-
ative peak spike measurements.
2. dB and dBm units are not allowed with an advanced fil-
ter.
3. With dB or dBm units selected, there is no bar graph on
zero-centered bar graph multiple display.
4. When units are changed from volts to dB or dBm with
A02 and greater firmware, all values less than zero that
depend on the new units are made equal to zero. This in-
cludes, for example, relative values and stored readings.
This avoids the overflow condition of a log of a negative
number.
dB = 20 log
V
IN
V
REF
------------
dBm = 10 log
V
IN
2
/Z
REF

1mW
----------------------------
… 51 …


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 Keithley 2001 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 Keithley 2001 in the language / languages: English as an attachment in your email.

The manual is 2,31 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.

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