Agilent Technologies 5517B Operation And Service Manual page 11

Except as described below, the HP 5517C Laser Head is physically identical to the HP 5517B Laser Head. The
primary difference between the two Laser Heads is that the difference between the two HP 5517C laser beam
frequencies is approximately 2.8 MHz, versus the 2.1 MHz difference in the HP 5517B. The larger frequency
difference allows measurements involving motion to be made at higher velocities (slew rates). (Velocity is an HP
5527A/B system Measurement Capability specification.)
The larger frequency difference of an HP 5517C Laser Head does not allow its use with HP 5501A or HP 5527A
electronics in making a measurement.
HP 5527B versus HP 5527A
In order to handle the larger frequency difference of the HP 5517C, changes were made in the HP 5527A, and its
Model Number was changed to HP 5527B. An HP 5527B can replace an HP 5527A, but the reverse is not always
true.
For making a measurement, an HP 5517B (lower frequency) Laser Head can be used with an HP 5527A, an
HP5527B, or an HP 5501 A.
For making a measurement, an HP 5517C (higher frequency) Laser Head can be used with an HP 5527B, but not
with an HP 5527A or an HP 5501 A.
TEST, ADJUSTMENT, AND TROUBLESHOOTING PROCEDURES
When an HP 5517B is used with an HP 5527B, installation, operation, and indications for procedures described in
this manual are the same as with an HP 5527A.
If an HP 5527B is not available (for use as a power source for an HP 5517C), an HP 5527A (or even an HP 5501 A)
can be used. The test, adjustment, and troubleshooting procedures in this manual do not depend on or require a
particular laser beam frequency. In these procedures, test points, adjustment points, and expected test results for an
HP 5517C are the same as those for an HP 5517B.
NOTE
AN HP 10946B/C AUTOMATIC COMPENSATION BOARD MAY NOT
NECESSARILY WORK STATICALLY WITH AN HP 5517C.