Sampling frequency when using USB6251 for SemiPeriod measurement

Hi there.
I am using the USB-6251 for frequency measurement. I use C# and the latest 8.5 drivers for .Net 3.5.
My question is this:
I have CounterInputChannel with MeasurementType=SemiPeriod.
The TimeBaseSource is "80MHzTImebase" and Prescaler is 1.
The reported minimum (CICHannel.Minimum property) is 25ns - 40MHz
I am measuring frequency on a 32.768kHz crystal which should be pretty stable and accurate. The measurements suggest that the samplerate is actually 20MHz, not 40MHz. This also makes sense, because if I try to create a frequency measurement, I am forced to use a divisor of 4 or more - which gives a sampling rate of 20MHz.
So my question is this: Is the reported minimum as read from CIChannel.Miminum wrong?

Additional info,
I downloaded and ran the DAQ diagnostic Utility v1.0 and got the following results, see below
Regards,
runson
9/16/2005 6:54:58 PM
Results saved to: C:\Documents and Settings\Runson\My Documents\Diagnostic Results.txt
Selected Device: Dev1
Device Type: PCI-6250
Serial Number: DE4115
Device Support: (PASS)
NI-DAQmx Version: 7.5 (PASS)
Device Reset: (PASS)
The device was last self-calibrated on: 9/15/2004 5:04:09 PM
Running Calibration ...   (PASS)
-------------------- Testing Counters... --------------------
Testing CTR Buffered Pulse Generation...   (PASS)
Testing CTR Single Pulse Generation...   (PASS)
-------------------- Testing Analog Input... --------------------
Testing AI Ground Reference...   (PASS)
Testing AI Voltage Reference...   (PASS)
Testing AI Finite Sample Clock...   (PASS)
Testing AI Finite Sample Clock Frequency...   (PASS)
-------------------- Testing Digital IO... --------------------
Testing DIO Lines...   (PASS)
Testing DIO Ports...   (PASS)
----- DIAGNOSTIC TEST COMPLETE -----

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598D06C10 00085BF1 0023BDA1 000DE19C 000DE19C [.[....#.........]
598D06C20 0000000C 00000000 2209160A 5BF10000 [..........."...[]
598D06C30 3EB10502 00C0F5CA 0031BDA1 00010205 [...>......1.....]
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598D06C50 4D554407 30373230 35BB0206 001100AE [.DUM0270...5....]
598D06C60 0001040A 000D000E 038A6D69 56B25735 [........im..5W.V]
598D06C70 729C0003 E19C0001 000C0006 000D0006 [...r............]
598D06C80 02BB0502 00C0F5CD 0023BDA1 000A0002 [..........#.....]
598D06C90 00C00013 000000D0 00030201 56B25736 [............6W.V]
598D06CA0 03890001 00000000 00000000 002E0105 [................]
598D06CB0 FFFF0003 00C0F5CD 56B25736 3EB10003 [........6W.V...>]
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598D06CD0 09CC0058 E75B0022 0009000F 00085BF1 [X...".[......[..]
598D06CE0 0024BDA1 000DE19D 000DE19D 0000000C [..$.............]
598D06CF0 00000000 2309160A 5BF10000 3EB10502 [.......#...[...>]
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598D06D10 03900974 00000019 00000000 3030300A [t............000]
598D06D20 33303030 06323132 AE35BB02 0B441100 [0003212...5...D.]
598D06D30 0001040A 000D000E 03900974 56B25736 [........t...6W.V]
598D06D40 729C0003 E19D0011 000C0006 000D0006 [...r............]
598D06D50 02BB0502 00C0F5CD 0024BDA1 00EA0002 [..........$.....]
598D06D60 00270016 000001FC 00032C01 56B25736 [..'......,..6W.V]
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598D06DC0 00010001 00010001 00010001 00010001 [................]
598D06DD0 00010001 00000001 00010001 00010001 [................]
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598DDFE20 6E696C72 72502067 6375646F 4C207374 [rling Products L]
598DDFE30 4E206474 C3025650 0380013D 0457454E [td NPV..=...NEW.]
598DDFE40 4E1E09C2 1E09C204 10C2024E 1E09C204 [...N....N.......]
598DDFE50 09C2044E C2024E1E 03C30510 021B0929 [N....N......)...]
598DDFE60 C3053DC3 0F192602 2602C305 C3050F19 [.=...&.....&....]
598DDFE70 0C1A6203 5102C105 C2041F4E 044E1E09 [.b.....QN.....N.]
598DDFE80 4E1E09C2 0410C202 4E1E09C2 1E09C204 [...N.......N....]
598DDFE90 10C2024E 2903C305 78071B09 011D0B71 [N......)...xq...]
598DDFEA0 BF020101 1FBF0215 4E018001 53014E01 [...........N.N.S]
598DDFEB0 0723002C 0B0C7178 0A3C3C18 30303030 [,.#.xq...<<.0000]
598DDFEC0 33373030 4D033337 47034255 36075042 [007373.MUB.GBP.6]
598DDFED0 38333936 4E113331 2065776B 74616C50 [693813.Nkwe Plat]
598DDFEE0 6D756E69 56504E20 0B0AC303 4E038001 [inum NPV.......N]
598DDFEF0 C2045745 0459512E 59512EC2 5253C203 [EW...QY...QY..SR]
598DDFF00 512EC204 2EC20459 C2035951 C3055253 [...QY...QY..SR..]
598DDFF10 1B092903 0B0AC303 3C04C305 C3053239 [.).........<92..]
598DDFF20 32393C04 4F08C305 C105114F 1F4E5102 [.<92...OO....QN.]
598DDFF30 512EC204 2EC20459 C2035951 C2045253 [...QY...QY..SR..]
598DDFF40 0459512E 59512EC2 5253C203 2903C305 [.QY...QY..SR...)]
598DDFF50 78071B09 01190A71 C0030101 C0034709 [...xq........G..]
598DDFF60 8001330A 4E014E01 002C5301 71780723 [.3...N.N.S,.#.xq]
598DDFF70 3C180B0C 30300A3C 30303030 33373337 [...<<.0000007373]
598DDFF80 42554D03 50424703 31304207 344C5131 [.MUB.GBP.B011QL4]
598DDFF90 6F725020 63657073 614A2074 206E6170 [ Prospect Japan ]
598DDFFA0 646E7546 64724F20 44535520 30302E30 [Fund Ord USD0.00]
598DDFFB0 04C30331 03800133 0557454E 5B1603C3 [1...3...NEW....[]
598DDFFC0 03C30521 04215B16 1F4004C3 1603C305 [!....[!...@.....]
598DDFFD0 C305215B 215B1603 4004C304 03C3051F [[!....[!...@....]
598DDFFE0 031B0929 043304C3 4D245AC2 245AC204 [).....3..Z$M..Z$]
598DDFFF0 02C3054D 040A1A18 494002C1 1603C305 [M.........@I....]
*** 2013-12-12 03:05:07.984
** LOGMINER WARNING - Invalidated 6 LCRs **
Complete dump of first invalid START LCR follows:
++ LCR Dump Begin: 0x0000000532C004E0 - CANNOT_SUPPORT
     op: 255, Original op: 3, baseobjn: 0, objn: 233316, objv: 1
     DF: 0x00000002, DF2: 0x00000000, MF: 0x00000000, MF2: 0x00000000
     PF: 0x40000001, PF2: 0x00002000
     MergeFlag: 0x00, FilterFlag: 0x00
     Id: 0, iotPrimaryKeyCount: 3, numChgRec: 4
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Dee

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