AMETEK Lx Series II - Manual (Page 38)

User Manual Lx / Ls Series II
34
Parameter Supplemental Specification
With –HF option: 1 Hz
Accuracy ± 0.025%
Phase
Phase Resolution Standard: standard specifications apply.
With –HF option: 0.5°
Phase Accuracy Standard: standard specifications apply.
With –HF option: < 2° + 1°/kHz
Note: Specification valid under equal load conditions.
2.6.6 –EXS Option Lx Series - Supplemental Specifications
The –EXS (External Sync) option allows the output frequency of the AC source to be synchronized to an
external TTL level clock signal. Note that some implementation changes were made starting with firmware
revision 1.50 as indicated below.
The following supplemental specifications apply when the Lx is configured with the external sync option. (-
EXS).
Parameter Supplemental Specification
Input
Voltage Input TTL Level square wave.
Impedance 10 KOhm.
Frequency
Range Same as internal clock mode. See configuration limits.
Max Sync Input Slew Rate Units with firmware revision less than 1.5: < 80 Hz / sec.
Units with firmware revision 1.5 or higher: < 250 Hz / sec
Max Sync Step Units with firmware revision less than 1.5: < 20 Hz.
Units with firmware revision 1.5 or higher: < 200 Hz
Errors
Error 804
External Sync Error
Following conditions will result in Error 804:
1.Loss of sync input signal
2. Sudden changes in sync input frequency (see max. sync step).
3. Fast changes in sync input frequency (see max sync slew rate).
Response time to detect sync fault is 400 msec. If a sync error occurs, the
output relay will be opened. Units with firmware revision less than 1.5 will
remain in External sync mode. Units with firmware revision 1.5 or higher
will revert back to Internal Sync mode.
Mode Selection Units with firmware revision less than 1.5:
When switching between INT and EXT sync mode, the output of the AC
source will be dropped momentarily.
Units with firmware revision 1.5 or higher:
When switching form INT to EXT sync mode, the internal frequency is set
to the detected ext sync frequency first, then the mode is switched to
external sync. This sync process takes about 200 msec so there will be this
much delay between receiving the EXT sync command and the actual
change of sync mode. The output does not drop out during this time.
Restrictions Frequency cannot be programmed in external sync mode.
Frequency transient list system is not available in sync mode.
Transient list dwell times are not correlated to external sync but based on
internal timebase.
Units with firmware revision 1.5 or higher:
When switching from INT to EXT sync mode, the difference between the
internal frequency present at the time and the external sync frequency may